Re: [PATCH v2] ALSA: hda/tegra: enable clock during probe

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On 1/30/2019 10:10 PM, Takashi Iwai wrote:
On Wed, 30 Jan 2019 13:45:49 +0100,
Jon Hunter wrote:

On 25/01/2019 11:06, Sameer Pujar wrote:
If CONFIG_PM is disabled or runtime PM calls are forbidden, the clocks
will not be ON. This could cause issue during probe, where hda init
setup is done. This patch enables clocks unconditionally during probe.

Along with above, follwoing changes are done.
   * enable runtime PM before exiting from probe work. This helps to avoid
     usage of pm_runtime_get_sync/pm_runtime_put() in probe work.
   * hda_tegra_disable_clocks() is moved out of CONFIG_PM_SLEEP check.
   * runtime PM callbacks moved out of CONFIG_PM check

Signed-off-by: Sameer Pujar <spujar@xxxxxxxxxx>
Reviewed-by: Ravindra Lokhande <rlokhande@xxxxxxxxxx>
Reviewed-by: Jon Hunter <jonathanh@xxxxxxxxxx>
---
  sound/pci/hda/hda_tegra.c | 26 +++++++++++++++++---------
  1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
index c8d18dc..ba6175f 100644
--- a/sound/pci/hda/hda_tegra.c
+++ b/sound/pci/hda/hda_tegra.c
@@ -219,7 +219,6 @@ static int hda_tegra_enable_clocks(struct hda_tegra *data)
  	return rc;
  }
-#ifdef CONFIG_PM_SLEEP
  static void hda_tegra_disable_clocks(struct hda_tegra *data)
  {
  	clk_disable_unprepare(data->hda2hdmi_clk);
@@ -227,6 +226,7 @@ static void hda_tegra_disable_clocks(struct hda_tegra *data)
  	clk_disable_unprepare(data->hda_clk);
  }
+#ifdef CONFIG_PM_SLEEP
  /*
   * power management
   */
@@ -257,7 +257,6 @@ static int hda_tegra_resume(struct device *dev)
  }
  #endif /* CONFIG_PM_SLEEP */
-#ifdef CONFIG_PM
  static int hda_tegra_runtime_suspend(struct device *dev)
  {
  	struct snd_card *card = dev_get_drvdata(dev);
@@ -283,7 +282,7 @@ static int hda_tegra_runtime_resume(struct device *dev)
  	int rc;
rc = hda_tegra_enable_clocks(hda);
-	if (rc != 0)
+	if (rc)
  		return rc;
  	if (chip && chip->running) {
  		hda_tegra_init(hda);
@@ -292,7 +291,6 @@ static int hda_tegra_runtime_resume(struct device *dev)
return 0;
  }
-#endif /* CONFIG_PM */
static const struct dev_pm_ops hda_tegra_pm = {
  	SET_SYSTEM_SLEEP_PM_OPS(hda_tegra_suspend, hda_tegra_resume)
@@ -551,9 +549,9 @@ static int hda_tegra_probe(struct platform_device *pdev)
dev_set_drvdata(&pdev->dev, card); - pm_runtime_enable(hda->dev);
-	if (!azx_has_pm_runtime(chip))
-		pm_runtime_forbid(hda->dev);
+	err = hda_tegra_enable_clocks(hda);
+	if (err)
+		goto out_free;
We also need to think about power-domains here. Enabling the clocks
might not be enough as the appropriate power-domain needs to be enabled.
For 64-bit Tegra runtime-pm will handle the power-domains (assuming they
are populated in device-tree). So I still think it is better we call
pm_runtime_get_sync() at some point rather than just replying on
enabling the clocks.
If I understand correctly the code, the pm domain is already activated
at calling driver's probe callback.

If there are no further concerns, can we consider this for approval?

Thanks,
Sameer.


thanks,

Takashi
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